SAN FRANCISCO — A federal judge in San Francisco is weighing whether the Trump administration violated federal law by sending National Guard troops to accompany immigration agents on raids in Southern California.

A three-day trial on the matter concluded Wednesday.

California has argued the troops violated the Posse Comitatus Act, which generally prohibits military enforcement of domestic laws. Lawyers for the administration said the law doesn’t apply because President Donald Trump called up the National Guard under an authority that allows their deployment if "the president is unable with the regular forces to execute the laws of the United States.”

Federal and military officials were called to testify, and the trial's third day largely focused on weedy arguments about the 1878 law and

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